Spindle-adjusting mechanism for drilling machines



Sqn, 15, 192s.

` J. T. WRIGHT SPINDLE ADJUSTING MECHANISM FOR, DRILLING IACHINBS FiledFeb. 21. 1924 lwm@ Patented Sept. l5, 1925.

UNITED J. IPANY, F CINCINNAT, OHIO. A. CORPORATIQN OF OHO.

SPINDLE-ADJUSTING MECHANISJNI FOR lDEtLiIhTGfv IlLACHINES.

Application filed February 21, 1924:, Serial No. 694,20?.

for adjustably setting),l the drill spindle,l and speciiically to a typeof drillingl machine as disclosed in prior application tiled by nieAugust 2li, 1922, Serial lNo. SQEJlQ-patented May G, 1924,:tt-1,493,457. v

The object ot my invention is lthe provision ot an imj roved means formicrolnetrically translating` tor adjustably `positioning the drillspindle and locking the same in its adjusted position7 which settingcannot be disturbed by any vertical thrusts upon the rotative drillspindle.

@ther objects and certan advantages will be disclosed in a descriptionoi' the drawings 1to1-ming` a part ot this application, and in saiddrawings: f

Figure l is a side elevation.

Figure 2 is a section on line 2 2 ot Figure l.

Figure is a detail view ot the spindle adjusting,l and lockingmechanism.

Figure l is a section taken on line 4.- lligure 3.

l contemplate the use of my invention upon a drillinpl unit of such siteand dimensions that a plurality of these drilling,l units may be mountedupon a rail and driven by a power shaft parallel to said rail. The worhis ted to the drillingl units by a movable table (not shown). Thedrilling unit comprises a spindle l journaled in a 'trame 2. 'this trameprovides -two spaced bearings 3 and d. rlhe :trame is attached to therail 5 by a dove-tail connection. @ne

doveetail element. 6 on the trame is fixed.V

The second dove-tail element 7 as a gib is se4 cured in position by arod 8 loosely traversing' said 'trame and having` a winged nut 9 uponits opposite end. Thus the unit may be moved upon the rail and clampedthereto at any desired point by tightening` the winged nut 9. The frame2 is provided with a casing` portion l0 above the bearing 3 providedwith a removable cover plate ll which is secured by a plurality ot boltsl2.

Passing through this casing portion is a power shaft 13. Splined to saidpower shaft is a bevel gear le. ln mesh with the bevel gear le isanother bevel gear which is splined to the spindle l.

Attached to the frame just below the bearing` a, by a bolt i6 is acutting discharge spout l?. The spindle l is provided with a passage 18connecting the interior ot said discharge spout l? with the interior otthe hollow drill 19 which is n'iounted in the end ot the spindle l.

Ayoked pressure toot 20 spans said drillV and 1s attached by a bolt 2ltoa pressure :toot rod 22. The pressure. toot rod is mounted in abracket 23 which is scour-d to the frame 2l on'the side opposed to therail. @oiled about that portion ot the pressure foot rod within thebracllzet is a co1npression spring 2li.' The tensionof this spring canbe regulated by means ot collar 25 adjustably secured to the pressureVtoot rod.

Between the bearings 2l and t is located my means ot inicrometriyl yadjustin v spindle and locking the sa` vin adjusteffl position. Theadjus by providing the sp .le with a eaded portion having'a nut encasedthereon l' f` ent is accomplished ment with the split collar theadjustment.

nut can be rotated and the spindle translated. By moving the lock collarback into toothed engagement with the split collar the lock isaccomplished. The collar is also adapted to move by gravity intocoupling with the split collar when released by the operator.

Adjacent bearing 3 is an end thrust bearing comprising, washers 26, 2T,between which are a plurality ot balls 28. Adjacent this end thrustbearing` is a split collar 29 rotatably secured to the spindle l by ascrew 30. Thus the split collar 29 is splined to the spindle to rotatetherewith but is free to be Vnioved upon the spindle axially. Adjacentthe bearing` 4 is a washer 3l and ad- CTL jacent said washer 31- isanot-her split collar 32 splined to the spindle 1 by means of a screw33. Between said split collars is an adjustment nut 34- threaded upon ascrewthread portion 35 of the spindle.

This adjustment nut 34 is held secure from axial motion by means of thesplit collar .29 and the end thrust bearing disposed between it andbearing 3 and by the split collar 32 and washer 31 disposed between itand bearing 4. In order to rkeep said adj ustment nut from being rotatedindependently of the spindle except for purposes of adjustment, Iprovide a lock clutch nonliirictienal in its nature. Splined to saidadjustment nut is a knurled lock collar 36, provided at one end withteeth 37 which fit into notches 38 in one of the split collars, in thiscase 3Q. By moving said knurled lock collar axially until the teeth 37are clear of the notches 3S and rotating said adjustment collar thespindle can be micrometrieally translated and adjusted to compensate fortool wear. I provide four teeth and notches so that every 90 theadjustment collar can be seated and a lock between the adjustment nutand the split collar which rotates with the spindle is therebyaccomplished.

Having described my invention, I claim:

1 A drill head, a spindle having a threaded portion rotatively andtranslatively journaled in said head, an adjustment nut held securelyagainst axial motion engaging said threaded portion of the spindle fortranslating the same, and a lock collar about said adjustment nutnormally securing said nut rotatively with thespindle but disengageablefor spindle adjustment.

2. A drill head, a spindle having a threaded portion rotatively andtranslatively journaled in said head, an adjustment nut held securelyagainst axial motion engaging said threaded portion of the spindle fortranslating the same, and a lock collar splined to the adjustment nutnormally having toothed engagement with an element rotatively connectedwith the spindle but disengageable therefrom for spindle adjustment.

3. A drill head providing spaced bearings, a spindle rotatively andtranslatively mounted in said bearings, said spindle having a threadedportion between said bearings, an adjustment nut about said threadedportion, split collars on either side of said adjust- .ment nut, an endthrust bearing between one of said split collars and one bearing, saidsplit collars and end thrust bearing holding the adjustment nut fromaxial motion, a lock collar splined to said adjustment nut providingnon-frictional engagement 'with one yof said split collars.

4. A drill head providing spaced bearings, a spindle rotatively andtranslatively journaled in said bearings, saidk spindle having athreaded portion between said bearings, an adjustment nut about saidthreaded portion secured against axial motion between said bearings, acollar splined tosaid spindle adjacent said adjustment nut, and a loclrcollar splined to said adjustment nut engageable with said collarsplined to the spindle.

5. A drill head providing spaced bearings, a spindle rotatively andtranslatively journaled in said bearings, said spindle having a threadedportion between said bearings, an adjustment nut about Said threadedportion secured against axial motion between said bearings, a collarsplined to said spindle adjacent said adjustment nut, a lock collarsplined to saidadjustment nut, and teeth providing engagement betweensaid lock collar and said collar rotating with the spindle.

6. A drill head, a spindle relatively rotatably and translatablydisposed in said head having a portion thereof threaded, an adjustmentnut engaged upon the threaded portion of said spindle fortranslatingsaid spindle, a collar adjacent one side of said nut andsplined to said spindle, and a movable collar splined to said nut,having a toothed connection with said first collar connecting saidparts. Y

In witness whereof, I hereunto subscribe my name.

JOSEPH T. WRIGHT.

